TL;DR: Padding yog ib feem ntawm cov kev qhia tshwj xeeb ntawm homthiab yog li tsis tas yuav ua los ntawm cov neeg siv khoom qub. Internally GCM tiag tiag yog CTR hom nrog rau polynomial hashing muaj nuj nqi siv rau lub ciphertext.
Puas AES siv padding?
[Rov qab] Padding yog siv rau hauv a block cipher qhov twg peb sau cov blocks nrog padding bytes. AES siv 128-ntsis (16 bytes), thiab DES siv 64-ntsis blocks (8 bytes). Cov txheej txheem padding tseem ceeb yog: … Cov ntaub qhwv no nrog 0x80 (10000000) ua raws li xoom (null) bytes.
AES GCM ruaj ntseg li cas?
Raws li rau GCM, nws yog qhov pib GCM=CTR + Authentication (tsis yog CBC). Nws ceev thiab ruaj ntseg yog siv kom raug, thiab ntau yam, yog li nws muaj koob meej. CBC yog laus dua, uas txhais tau tias muaj kev sib raug zoo dua thiab tsuas yog tag nrho cov laj thawj keeb kwm. Muaj qhov ua tau zoo, yog tias koj tsis xav tau GCM rau qhov tseeb.
Puas AES GCM muab kev ncaj ncees?
AES-GCM tsim nyog los ua haujlwm hauv kev sib txuas lus lossis kev siv hluav taws xob [3]. AES-GCM yog ib qho thaiv cipher hom kev ua haujlwm uas muab siab nrawm ntawm kev lees paub qhov tseeb thiab cov ntaub ntawv kev ncaj ncees.
Is AES GCM yog block cipher?
GCM yog tsim los ntawm kev pom zoo symmetric tseem ceeb thaiv ciphernrog qhov loj ntawm 128 khoom, xws li Advanced Encryption Standard (AES) algorithm uas tau teev tseg hauv Tsoom Fwv Teb Chaws Cov Ntaub Ntawv Ua Haujlwm Standard (FIPS) Pub. 197 [2] ib. Yog li, GCM yog hom kev ua haujlwm ntawm AES algorithm.
What is GCM? Galois Counter Mode (of operation) (usually seen as AES-GCM)
