i was doing some testing recently with the "Android Debug Bridge" ADB, but the device was refusing APK upload. it appears that the recent JB 4.2.2 has a security update:
http://android-developers.blogspot.com/2013/02/security-enhancements-in-jelly-bean.html
which means that you will need to update your Android SDK and copy / use the adb.exe (and all dependencies from "/platform-tools"), which should be version >= 1.0.31 as of this point.
--
Showing posts with label crypto. Show all posts
Showing posts with label crypto. Show all posts
Thursday, February 21, 2013
Saturday, January 31, 2009
#Quantum cryptography
You can check the following lecture by Daniel Gottesman on quantum cryptography, if you are interested in the possibilities of using quantum-computers, q-bits and super-positioning in cryptography.
Quantum computers are yet to be designed since its very difficult to tame particles and their behavior. But already, there are some very baby-stage prototypes. If you have watched science-fiction shows like StarTrek, you may have noticed that they don't use binary computers (with ones and zeros - 01010010) they use something more advanced. Maybe quantum computers are the future. They are supposed to be times faster, than any normal computer.
The lecture is 1hour, 15min long:
video at video.google.com
"Daniel Gottesman - Perimeter Institute for Theoretical Physics Sensitive information can be valuable to others - from your personal credit card numbers to state and military secrets. Throughout history, sophisticated codes have been developed in an attempt to keep important data from prying eyes. But now, new technologies are emerging based on the surprising laws of quantum physics that govern the atomic scale. These powerful techniques threaten to crack some secret codes in widespread use today and, at the same time, offer new quantum cryptographic protocols which could one day profoundly alter the way we safeguard critical information."
Quantum computers are yet to be designed since its very difficult to tame particles and their behavior. But already, there are some very baby-stage prototypes. If you have watched science-fiction shows like StarTrek, you may have noticed that they don't use binary computers (with ones and zeros - 01010010) they use something more advanced. Maybe quantum computers are the future. They are supposed to be times faster, than any normal computer.
The lecture is 1hour, 15min long:
video at video.google.com
"Daniel Gottesman - Perimeter Institute for Theoretical Physics Sensitive information can be valuable to others - from your personal credit card numbers to state and military secrets. Throughout history, sophisticated codes have been developed in an attempt to keep important data from prying eyes. But now, new technologies are emerging based on the surprising laws of quantum physics that govern the atomic scale. These powerful techniques threaten to crack some secret codes in widespread use today and, at the same time, offer new quantum cryptographic protocols which could one day profoundly alter the way we safeguard critical information."
Saturday, January 10, 2009
#SJEA - Simple Java Encryption Algorithm
Not long ago (around 2007), I wrote this very simple encryption algorithm to help out a friend with the master's degree in computing. After a while I realized this could turn out to be a great stand alone project.
It was collecting dust for quite some time (one year or so) and I've decided that I should work more on this and complete it as a accessible public package. So recently I've managed to tidy the source, make some examples, write the documentation and now its finished - SJEA (Simple Java Encryption Algorithm). I have to admit the name is a bit silly for the simple reason that the 'J' can be replaced very easily (with source porting) to 'C' as a 'Simple C Encryption Algorithm' SCEA or anything else to be honest.
Going back to cryptography studies was pure fun. Back in the day around y2000 I was reading a lot on the subject and this resulted a lot of drafts. I guess this project will be the first I release under GPL. Now back on the topic.
SJEA v1.0SJEA started when I was looking for an alternative solution (a completely custom algorithm) to all the pre-made libraries in JAVA, C etc. Having something for granted is cool, but making your own tools may give you some great satisfaction. The idea of the project was that the result are good (not that easy to hack/decrypt with conventional tools) but the source (roots of the algorithm) easy to understand by people who are new to this type of study. So I've decided to have a go with Block and XOR ciphers. I was dealing with such for quite a while, so it wasn't a problem to implement them into some sort of a starting template.
The XOR method (the method behind all the calculation) is quite simple to understand:
We have an input byte that we sum with a key (modifier) and then we have a result. But if we subtract the key from the end result we will get the original input byte.
In SJEA the 'ECB' (Electronic codebook) window method can be found since we use a user password as our key. The password is used as a first layer of encryption. A vector byte-array is also present as a second layer. This complicates things a little (not that much) since even if you know the key modifier layer you wouldn't know the value of the vector.
Here is the 2-layer encryption scheme:
The project can be aimed at the following audiences:
- students of computing
- future algorithm programmers
- people who a learning into cryptography
It may eventually grow into a lot bigger project with many different encryption examples.
And here is a brand new website hosted by sourceforge.net:
http://sjea.sourceforge.net/
or the googlecode page:
http://code.google.com/p/sjea/
Lubomir
It was collecting dust for quite some time (one year or so) and I've decided that I should work more on this and complete it as a accessible public package. So recently I've managed to tidy the source, make some examples, write the documentation and now its finished - SJEA (Simple Java Encryption Algorithm). I have to admit the name is a bit silly for the simple reason that the 'J' can be replaced very easily (with source porting) to 'C' as a 'Simple C Encryption Algorithm' SCEA or anything else to be honest.
Going back to cryptography studies was pure fun. Back in the day around y2000 I was reading a lot on the subject and this resulted a lot of drafts. I guess this project will be the first I release under GPL. Now back on the topic.
SJEA v1.0SJEA started when I was looking for an alternative solution (a completely custom algorithm) to all the pre-made libraries in JAVA, C etc. Having something for granted is cool, but making your own tools may give you some great satisfaction. The idea of the project was that the result are good (not that easy to hack/decrypt with conventional tools) but the source (roots of the algorithm) easy to understand by people who are new to this type of study. So I've decided to have a go with Block and XOR ciphers. I was dealing with such for quite a while, so it wasn't a problem to implement them into some sort of a starting template.
The XOR method (the method behind all the calculation) is quite simple to understand:
We have an input byte that we sum with a key (modifier) and then we have a result. But if we subtract the key from the end result we will get the original input byte.
where A-input, B-mod, C-sum for a single byte entry
A+B=C //encryption
C-B=A //decryption
In SJEA the 'ECB' (Electronic codebook) window method can be found since we use a user password as our key. The password is used as a first layer of encryption. A vector byte-array is also present as a second layer. This complicates things a little (not that much) since even if you know the key modifier layer you wouldn't know the value of the vector.
Here is the 2-layer encryption scheme:
(bytes)
input: AAAAAAAAAAAAAAAAAAAAA + (sum)
vector: 01234567890ABCDEF0123 + (sum)
password: HELLOHELLOHELLOHELLOH =
result: XXXXXXXXXXXXXXXXXXXXX
The project can be aimed at the following audiences:
- students of computing
- future algorithm programmers
- people who a learning into cryptography
It may eventually grow into a lot bigger project with many different encryption examples.
And here is a brand new website hosted by sourceforge.net:
http://sjea.sourceforge.net/
or the googlecode page:
http://code.google.com/p/sjea/
Lubomir
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