only adj. 1.唯一的。 2.无比的,独一无二的;最适当的。 an only child 独生子。 This is the onlyexample [These are the only examples] I know. 我知道的例子只有这一个[这些]。 one's only hope 某人的唯一希望。 the only man present 唯一的出席者[在场的人]。 He's the only man for the position. 他是最适宜那个职位的人。 adv. 1.仅仅;只,单,才;不过。 2.结果却;不料。 I can only guess [guess only]. 我只能推测罢了。 O- I [I only] can guess. 只有我能够猜得出。 O- fancy! 想想看罢!He came only yesterday. 他是昨天才来的。 He went to the seaside only to be drowned. 他去海边游泳结果却淹死了。 if only 只要…,只要…就好了 (If only he would stop talking! 只要他不讲话就好了)。 not only ... but (also) 不但…而且…。 only by ... can ... 只有…才能…。 only just 好容易;刚刚才;恰好 (I have only just received it. 我才收到。I was only just in time.我刚好赶上)。 only not 简直是;跟…差不多。 only too 极,太,非常;实在;可惜(only too glad 极乐意 (to do)。 only too true 千真万确)。 1.但是,可是。 2.〔与 that 同用〕除了…;要不是…。 He makes good resolutions, only he never keeps them. 他决心虽好,但不能持久。 I should like to go, only that I am ill. 我倒很想去,可是我有病。 only for 要是没有 (O- for my tea, I should have had the headache. 要是不喝茶,我又会犯头痛病了)。
attack vt. 1.攻击 (opp. defend)。 2.非难,抨击。 3.着手,动手,投入。 4.(疾病)侵袭。 5.【化学】腐蚀。 We will not attack unless we are attacked; if we are attacked, we will certainly counter- attack。 人不犯我,我不犯人;人若犯我,我必犯人。 attack a task 动手工作。 attack a problem 着手解决问题。 Strong acids attack metals. 强酸对金属有腐蚀作用。 be attacked with (a disease) 害(病)。 n. 1.攻击 (opp. defense), 袭击。 2.抨击。 3.【航空】迎角,冲角,攻角。 4.着手,动手。 5.发作,发病。 6.(表演或竞赛中的)主动。 A- is the best defense. 进攻是最好的防御。 an attack formation 攻击队形。 have an attack of 为…所侵袭;害,患(病)。 make an attack on 攻击。 n. -er 攻击者。
The method in question is a ciphertext - only attack . this means that we don ' t need bits of guessed / known plaintext for a successful decryption 解决问题的方法是对纯密码信息进行攻击。这意味着我们不需要猜解或在已知明码文本的某些比特位信息的情况下来对密文进行完美解密。
百科解释
In cryptography, a ciphertext-only attack (COA) or known ciphertext attack is an attack model for cryptanalysis where the attacker is assumed to have access only to a set of ciphertexts.